Jack Sock
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Jack Sock, of the United States, prepares return to Guido Pella, of Argentina, during a match at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. Sock won 6-3, 6-4 (AP Photo/Alan Diaz)

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Jack Sock reacts to the serve of Ivo Karlovic, of Croatia, in the quarterfinal match at the U.S. National Indoor Tennis Championships, Friday, Feb. 14, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)

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Ivo Karlovic, of Croatia, hits a return to Jack Sock in the quarterfinal match at the U.S. National Indoor Tennis Championships, Friday, Feb. 14, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)